package com.xl.rentkeeper.view;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.RelativeLayout;
import android.widget.ScrollView;
import android.widget.Scroller;

/**
 * 自定义可以滑动的RelativeLayout, 类似于IOS的滑动删除页面效果，当我们要使用
 * 此功能的时候，需要将该Activity的顶层布局设置为SildingFinishLayout，
 * 然后需要调用setTouchView()方法来设置需要滑动的View
 */
public class SildingFinishLayout extends RelativeLayout implements
        OnTouchListener {
    private static final String TAG = "SildingFinishLayout";
    private VelocityTracker vTracker = null;
    /**
     * SildingFinishLayout布局的父布局
     */
    private ViewGroup mParentView;
    /**
     * 处理滑动逻辑的View
     */
    private View touchView;
    /**
     * 滑动的最小距离
     */
    private int mTouchSlop;
    /**
     * 按下点的X坐标
     */
    private int downX;
    /**
     * 按下点的Y坐标
     */
    private int downY;
    /**
     * 临时存储X坐标
     */
    private int tempX;
    /**
     * 滑动类
     */
    private Scroller mScroller;
    /**
     * SildingFinishLayout的宽度
     */
    private int viewWidth;
    /**
     * 记录是否正在滑动
     */
    private boolean isSilding;

    private OnSildingFinishListener onSildingFinishListener;
    private boolean isFinish;


    public SildingFinishLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public SildingFinishLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
        mScroller = new Scroller(context);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        if (changed) {
            // 获取SildingFinishLayout所在布局的父布局
            mParentView = (ViewGroup) this.getParent();
            viewWidth = this.getWidth();
        }
    }

    /**
     * 设置OnSildingFinishListener, 在onSildingFinish()方法中finish Activity
     *
     * @param onSildingFinishListener
     */
    public void setOnSildingFinishListener(
            OnSildingFinishListener onSildingFinishListener) {
        this.onSildingFinishListener = onSildingFinishListener;
    }

    /**
     * 设置Touch的View
     *
     * @param touchView
     */
    public void setTouchView(View touchView) {
        this.touchView = touchView;
        touchView.setOnTouchListener(this);
    }

    public View getTouchView() {
        return touchView;
    }

    /**
     * 滚动出界面
     */
    private void scrollRight() {
        final int delta = (viewWidth + mParentView.getScrollX());
        // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item
        mScroller.startScroll(mParentView.getScrollX(), 0, -delta + 1, 0,
                Math.abs(delta));
        postInvalidate();
    }

    /**
     * 滚动到起始位置
     */
    private void scrollOrigin() {
        int delta = mParentView.getScrollX();
        mScroller.startScroll(mParentView.getScrollX(), 0, -delta, 0, Math.abs(delta));
        postInvalidate();
    }

    /**
     * touch的View是否是AbsListView， 例如ListView, GridView等其子类
     *
     * @return
     */
    private boolean isTouchOnAbsListView() {
        return touchView instanceof AbsListView ? true : false;
    }

    /**
     * touch的view是否是ScrollView或者其子类
     *
     * @return
     */
    private boolean isTouchOnScrollView() {
        return touchView instanceof ScrollView ? true : false;
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        float speed = 0;
        boolean tt = true;
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                //Log.d(TAG, "" + mParentView.getScrollX());
                downX = tempX = (int) event.getRawX();
                downY = (int) event.getRawY();
                //添加的滑动速度的监听
                if(vTracker == null){
                    vTracker = VelocityTracker.obtain();
                }else{
                    vTracker.clear();
                }
                vTracker.addMovement(event);
                break;
            case MotionEvent.ACTION_MOVE:
                int moveX = (int) event.getRawX();
                int deltaX = tempX - moveX;//移动的距离
                tempX = moveX;
                if (Math.abs(moveX - downX) > mTouchSlop
                        && Math.abs((int) event.getRawY() - downY) < mTouchSlop) {

                    //设置为正在滑动
                    isSilding = true;


                    // 若touchView是AbsListView，
                    // 则当手指滑动，取消item的点击事件，不然我们滑动也伴随着item点击事件的发生
                /*if (isTouchOnAbsListView()) {
					MotionEvent cancelEvent = MotionEvent.obtain(event);
					cancelEvent
							.setAction(MotionEvent.ACTION_CANCEL
									| (event.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT));
					v.onTouchEvent(cancelEvent);
				}
*/
                }

                //正在移动的时候

                if (moveX - downX >= 0 && isSilding) {
                    //添加滑动监听事件
                    vTracker.addMovement(event);
                    //设置单位时间,表示一秒钟内,滑动的像素
                    vTracker.computeCurrentVelocity(1000);
                    mParentView.scrollBy(deltaX, 0);//设置移动的距离
                    // 屏蔽在滑动过程中ListView ScrollView等自己的滑动事件
				/*if (isTouchOnScrollView() || isTouchOnAbsListView()) {
					return true;
				}*/
                }
                break;
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                //获取滑动的速度
                speed = vTracker.getXVelocity();
                Log.d(TAG, "speed:  " + speed);
                isSilding = false;
                if (mParentView.getScrollX() <= -viewWidth / 3 || Math.abs(speed) > 1000) {
                    isFinish = true;
                    Log.d(TAG, "out");
                    scrollRight();
                } else {
                    scrollOrigin();
                    Log.d(TAG, "in");
                    isFinish = false;
                }
                break;
        }



        // 假如touch的view是AbsListView或者ScrollView 我们处理完上面自己的逻辑之后
        // 再交给AbsListView, ScrollView自己处理其自己的逻辑
		/*if (isTouchOnScrollView() || isTouchOnAbsListView()) {
			return v.onTouchEvent(event);
		}*/

        // 其他的情况直接返回true
        return true;
    }

    @Override
    public void computeScroll() {
        // 调用startScroll的时候scroller.computeScrollOffset()返回true，
        if (mScroller.computeScrollOffset()) {
            mParentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
            postInvalidate();

            if (mScroller.isFinished()) {

                if (onSildingFinishListener != null && isFinish) {
                    onSildingFinishListener.onSildingFinish();
                } else {
                    //如果没有设置回调接口, 直接划到起始位置
                    // scrollOrigin();
                }
            }
        }
    }


    public interface OnSildingFinishListener {
        public void onSildingFinish();
    }

}
